A bright or dark image can many times be corrected by adjusting color settings on the camera or video recorder. For more information on color settings, please refer to the Video steam is discolored (blue, green or red hue) article. Adjusting the Gain (located in the color settings) higher can provide a brighter picture in dark environments (i.e. night) but will also cause noise levels to increase. Automatic Gain setting is preferred.
Also, on analog cameras with OSD (Effio), disabling the BLC (backlight compensation) feature can correct an overly bright picture during the day. Other features such as WDR (available on the 927W camera) can improve image quality related to scene brightness.
By default, shutter speed is set to automatic, however if the shutter speed was changed to manual, this may cause a bright or dark image depending on the setting. The faster the shutter speed (i.e. 1/4000) the darker the image; conversely, the slower the shutter speed (i.e. 1/30) the brighter the image and may cause moving objects to appear blurry (ghosting). For network IP cameras the shutter speed can be set in the Web Service on the camera or on the network video recorder. The installer can adjust shutter (exposure) speeds on analog cameras with an OSD. For more information on blurry image, refer to the Moving objects in video appear blurry article